<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body></body>
  <script>
    let Car = function () {};
    let benz = new Car();
    let resultOne = benz instanceof Car;


    let car = new String('TEST');
    let resultTwo = car instanceof String;

    let str = '好好学习';
    let resultThree = str instanceof String;

    console.log(resultOne, resultTwo, resultThree);
  </script>
</html>
